If you are one of those rare individuals or investors making a cash offer to buy a home, it only makes sense to provide some documentation with your offer that shows you have the funds available. A bank statement would usually be the best proof of funds. Additionally, a certified financial statement or copy of a money market account balance will qualify as your proof of cash funds. If you have to liquidate stock or some other asset, your offer should give a timetable on when you will provide proof you have converted the asset to cash. Ideally, you will have the proof of funds documents ready to go before you submit an offer on a house.